Musannaf Ibn Abi Shaybah 18096 — A man who marries a woman on her own

Ibn Sirin (may Allah have mercy on him) said: Sayyiduna al-Ash'ath (may Allah be pleased with him) married a woman on the basis of whatever dowry she would ask for. Sayyiduna Umar (may Allah be pleased with him) asked him about her, and he said: I spent a night that only Allah knows of, afraid that she would demand of me the wealth of Qays. Sayyiduna Umar said: She is not entitled to that; she is only entitled to the dowry customary for women like her.